From the manufacturer: Based on the principle of riddles, Nature Keeps You Guessing presents facts about common animals and plants revealed one at a time from vague to givaway. 40 cards represent 5 families of species (Mammal, Insect, Vegetable, Fruit, and Bird). Players try to be the first to guess which animal or plant is behind the different clues read aloud. The winner is the first player to collect 1 card in each category of living beings. Each card features a humorous illustration.